I believe the Neumann conditions are strongly imposed. And yes - I realised that inhomogeneous Neumann bc is ambiguous phrasing.
I mean that I have a conditions k grad p.n =g, or u.n = g equivalently, I think this is in point 3 in my notes in my original post but i think it was unclear what u was. I want to impose a nonzero condition on the normal derivative of the pressure. Many thanks! On Wednesday, August 29, 2018 at 3:18:36 AM UTC+1, Wolfgang Bangerth wrote: > > On 08/28/2018 08:07 AM, Jane Lee wrote: > > > > I am trying to solve the equations in step-20 with inhomogeneous neumann > bcs > > on one of the boundaries and getting something very bizarre. > > step-20 uses a mixed formulation in which both the pressure and the > velocity > (in essence, the gradient of the pressure) are primary variables of the > problem. > > In cases like this, it is often unclear what exactly you mean when you say > "inhomogenous Neumann boundary conditions". Can you clarify what exactly > you > mean there? Do you want to prescribe the velocity, the pressure, or the > normal > derivative of the pressure (which equals the normal component of the > velocity)? > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: bang...@colostate.edu > <javascript:> > www: http://www.math.colostate.edu/~bangerth/ > > -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
